Re: [Xen-users] small cluster storage configuration?

[Miles Fidelman <mfidelman@xxxxxxxxxxxxxxxx>]

Hi Iustin,

Iustin Pop wrote:
> Have you tried Ganeti (http://code.google.com/p/ganeti)? It uses DRBD
> under the hood but it manages moving instances around without you having
> to reconfigure instances. I think it matches what you're looking for,
> and we support clusters from 1 physical machine up to hundreds.
>
> Disclaimer: I'm one of the authors.
I've experimented with Ganeti a couple of times, but not for about 6 
months (and I know it's been evolving quickly).  I was really impressed 
with Ganeti as a tool for managing lots of VMs - but it seemed to be 
lacking when it comes to high-availability capabilities.  In particular:
Last time I looked, there was some documentation and list discussion 
that made explicit statements that Ganeti is NOT a high-availability 
solution - migration and failover require manual intervention, or 
customization/extension by a user.  When I realized that some of the 
things that one might do with Pacemaker would interact with some of 
Ganeti's control wiring, I decided that I really didn't want to wrestle 
with that level of complexity (at least not when there were easier ways 
to do a 2-node configuration).  A quick look at the current 
documentation suggests this hasn't changed.
Re. DRBD: It looks like one still is limited to a primary instance, with 
failover to a pre-configured secondary instance - and one has to 
manually recreate a new secondary after a node failure.  Hence my 
interest in some kind of cluster filesystem that provides redundancy 
across multiple nodes.  (Sheepdog really has my attention in this regard 
- but it seems to only work with KVM, not Xen).
Thanks!

Miles





--
In theory, there is no difference between theory and practice.
In<fnord>  practice, there is.   .... Yogi Berra



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